Incandescent lamp fitting



INVENTOR A. SWAN. INGANDESGENT LAMP FITTING.

Fig. 1.

(No Model.)

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ALFRED SWAN, OF'NEW YORK, N. Yr

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SFEGKFKUATION forming part oi. Letters Patent .hlo. 573,929, dated December 29, 1896.

A li ation fil d March 128, 1896. derial lilo. 585,219i (No modeLl' useful improvements in Incandescent-Lam p v Fittings. of which the following is a full, clear,

and exact description. i

This invention relates to electric incandes-- cent lamps and sockets, the object being o simplify to the greatest extent the devices and construction necessary to connect and disconnect the lamp with its socket. By this invention no base, in the ordinary sense of.

the term, is attached to the lamp, but in lieu thereof the lamp has a simple and inexpen sive mount attached to it, this mount providin g the respective electrodes and also a in cans whereby the lamp is coupled or connected 2'0 with its socket. This mount is applied Without the use of cement, andis so simple that it adds but very little to the cost of the lamp.

'lhe socket is correspondingly simple and possesses several features .of advantage.

in the accompanying drawings, Figure 1 is a section of the socket provided with akey and having an extra metallic shelll l ig. 2 is a section of the socket, taken at right angles to Fig. 1 and Without the metallic shell. Fig. 3 is a plan of the socket. Fig; 4 is a section of the neck of a lamp, and Fig. 5 is aside elevation of the same.

flhe mount tor-the base of the lamp'consists of a collar a of thin sheet spring-brass,

having one edge 'tunned inward and slit, as

indicated in Fig. 5, to form spring-teeth. The glass neck of the lamp is formed with a head or other projection I), over which the brass collar is sprung, the spring-teeth of the collar seating themselves under the head and holding it in place. To prevent rotary slipping of the collar, it has a notch a to engage with a slight projection formed iii the glass" At two or more points of the cylindrical portion of the collar small teats or projections a are provided, for a purpose'which ill hereinafter appear, The stem 0 of the lamp, through which the leading in wires loosely pass, Will he closed at its upperend with acork or plug c, having a hat outer surface covered hy a cap c n't thin metal. it is preferred to make this plugo'f 'o'rdinarycorlr, hut Wood or other insulating materialinay he used. This plug serves the double function of separating the lea'ding-inwires and sustaining the center contaht. The two WllfiS of the lamp are confined between the plug and the glass Walls of the stem and on opposite sides of the plug and lead, respectively, to the cap 0 and to the collar or, to which they are soldered. -A portion of the side of the cap is removed, as indicated in Fig. 5, to preventa contact therewith oi? the wire leading to the collar. r,

The socltetadapted for this lamp consists of a cup 2, constructed of porcelain and haw ing a ring c' located internally around its lower edge. 3 This ring is formed with angular slots adapted to engage with the teats a on the collarof the lamp to form an ordinary bayonet-joint. in the center of the socket a passage f is provided, in which is fitted first a metallic block'f, centrally'perforated to receive on e of the circuit-Wires. Then a metallic spring f is inserted, and thisiS covered by a plunger f. The face of this plunger makes contact with the cap a? when the lamp is connected to the socket.

The block. f is held in place by means of a screw fi passing through a transverse opening in the socket and inthe plug itself, and the circuitovire is afterward held in the block by passing a second screw f through the same opening and binding it against the wire. By the side of the central perforation a second perforationg is formed, also contai sing a me tallic block g and perforated to receive the other circuit-Wire. To the inner face of the plug is attached an annular spring h, surrounding the central contact and passing above the circuit-closing block 2, carried upon the ltey-shaft i. immediately below the block ,7

an angular projection j from the ring e is located, with which the block is adapted to engage to electrically connect-the contact-ring h with the ring For the keyless socket this annular projection j, and of course the fhloclt and key, also the ring h, are dispensed with and a permanentwire (indicated in the dotted lines in) Willconnect the ring c with the plug g. if desired, th'eexterior of the porcelain shell may have coarse screw-threads formed in it for the purpose of engaging with a similarly-threaded collar Z, to which the arms if of the shade-carrierareattached. As

shown in the drawings, however,these threads are formed in a metallic shell covering the socket and with which the shade-carrier engages. By this mode of attachment the shadecarrier is conveniently adjusted and removed and its elevation may be somewhat changed at will.

Among the advantages of my invention may be mentioned the non-liability of lamps to loosen and drop out. Both lamp and intermediary device being independently looked,

a firm and close contact is always-maintained and arcing is impossible. A lamp projecting horizontally may at any time be reversed to rectify the position of a filament that may have sagged downward. It admits of a socket of short length. It is inexpensive. The lamp being relieved of the weight of the base, there is less risk of breakage in transit.

Having thus described my invention, I c1aimv 1. The combination with the neck of an incandescent lamp provided with ahead of glass at or near the end thereof, of a metallic collar placed thereon entirely behind said bead of glass, said collar forming one of the lamp terminals, substantially as described.

2. The combination with the neck of an incandescent lamp provided with an annular bead, of a metallic collar having inwardlyturned spring-teeth adapted to spring over the bead and rest directly and entirely behind it to hold the collar on the neck of the lamp.

3. The combination with the neck of an incandescent lamp, of a metallic collar placed thereon behind a head of glass formed on the lamp-neck and a cork or plug closing the end of the lamp-stem and provided with a metallic cap, the 'leading-in wires of the lamp being separated by the cork and connected respectively with the cap and collar, substantially as described.

4-. In an incandescent lamp having its neck surrounded by a metallic collar and provided with a center contact-piece in combination with a cup-shaped socket of insulating material provided internally with a center contact and with a narrow metallic ring placed near the edge of the cup, the ring having an extension j reaching into the socket for the purpose set forth.

In testimony whereof I subscribe in y signature in presence of two witnesses.

Witnesses:

WM. A. RosENBAnM,

II. BAILEY. 

